I would like to thank Blake Harvard @effortfuleduktr who discusses the concept of concreteness fading https://theeffortfuleducator.com/2018/01/01/a-more-concrete-classroom/ where he explains and quotes how
“Dr. Kuepper-Tetzel provided some information that took my understanding of concrete examples to another level.  She explained:”
“The crucial point about concrete examples is that you need to make sure that you carefully transition to more abstract ideas…this is called concreteness fading. Don’t get stuck with concrete examples only.”

This reminded me of a big break through moment for all of our teachers during our Let’s Think in English training by Michael Walsh @mikefnw75.  It was after a lesson observation where Michael led a discussion about teacher mediation. He made us aware of the difference between discussing and thinking around issues raised in the text that was used as the stimulus for the lesson. Then he showed us how we could move up a meta-level to the reasoning that was taking place. This move is exactly the idea of concreteness fading into the metacognition and bridging phases of the LT methodology.
Thanks Blake for extending my awareness how the multiplicity of ways in which this move can be applied.